1924] 
Review of the Dipterous Family Piophilidce 
81 
the blackened portions of the veins at the apex of the wing, an- 
terior crossvein at middle of discal cell and a little shorter than 
half the length of the posterior crossvein. 
Types, twenty-six males and eleven females, in the vicinity 
of Longmire, Mt. Rainier, Washington, July, 1922. The spec- 
imens were taken disporting themselves on the underside of 
the shelf-fungus, Polyporus, growing on tree-trunks in the 
shady woods. They would not readily take to flight but were 
secured by suddenly blowing them into the net. 
Mycetaulus testaceus, n. sp. 
Male. Length 3.5 mm. Head and thorax entirely testaceous 
abdomen black, legs yellowish with the front tarsi and apical 
joints of posterior tarsi black; wings uniformly subhyaline. 
Occiput dull, its setulae black; front wider than long, its setulse 
fine and black. Hairs of mesonotum very fine and abundant, 
black, only the posterior dorsocentral developed; abdomen 
truncate at tip, genitalia small, without processes. Calypteres 
fringed with white hairs, halteres white; costa and first vein 
blackish, other veins yellowish at base, becoming darker distally, 
two apical sections of costa subequal, anterior crossvein very 
slightly beyond middle of discal cell, one-third as long as posterior 
cross vein. 
Type, Moscow Mt., Idaho, 24 June 1919; two paratypes, 
Ilwaco, Washington, May and July. 
The single dorsocentral bristle suggests Piophila were it not 
that the humeral and presutural bristles are strong as in Myce- 
taulus. Location in this genus is further indicated by the yellow 
body-color, two strong sternopleurals, long cephalic bristles and 
undoubted relationship to M. polypori. 
Prochyliza brevicornis, n. sp. 
Similar to P. xanihostoma in coloration except that the 
yellow of the face continues over the antennae across the anterior 
part of the front. This yellow portion of the front curves down. 
